package com.dang.alex.servlet.home;

import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Random;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.dang.alex.model.Book;
import com.dang.alex.model.Category;
import com.dang.alex.model.Product;
import com.dang.alex.service.ProductService;
import com.dang.alex.service.imp.ServiceDAOFactory;

@WebServlet("/main.do")
public class MainServlet extends HttpServlet {
	private static final long serialVersionUID=4203324038024016589L;
	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		// TODO Auto-generated method stub
		doPost(req, resp);
	}
	
	@Override
	protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		// TODO Auto-generated method stub
		String method=req.getParameter("method");
		Map<String, List>datas=new HashMap<String,List>();
		if(method!=null) {
			switch(method) {
			case "1":
				productDetail(req,resp);
				break;
			default:
				break;
			}
		}else {
			initCategory(datas);
			initRecommend(datas);
			initHotBooks(datas);
			initNewBooks(datas);
			req.setAttribute("datas", datas);
			req.getRequestDispatcher("/WEB-INF/view/home/main.jsp").forward(req, resp);
		}
	}
	
	private void initRecommend(Map<String, List> datas) {
		List<Book> books=new ArrayList<Book>();
		ProductService productService=ServiceDAOFactory.getProductService();
		try {
			books.add((Book)productService.findById((int)(Math.random()*20+1)));
			books.add((Book)productService.findById((int)(Math.random()*20+1)));
			datas.put("books", books);
		}catch(Exception e) {
			e.printStackTrace();
		}
	}
	
	private void productDetail(HttpServletRequest req,HttpServletResponse resp) throws ServletException, IOException{
		Book book=null;
		try {
			String id=req.getParameter("id");
			if(id!=null) {
				book=(Book)ServiceDAOFactory.getProductService().findById(new Integer(id));
			}
		}catch(Exception e) {
			e.printStackTrace();
		}
		req.setAttribute("book", book);
		req.getRequestDispatcher("/WEB-INF/view/home/product.jsp").forward(req, resp);
	}
	private void initNewBooks(Map<String,List> datas) {
		List<Book>books=new ArrayList<Book>();
		try {
			for(Product p:ServiceDAOFactory.getProductService().findByNew(4)) {
				books.add((Book)p);
			}
			datas.put("newBooks", books);
		}catch(Exception e) {
			e.printStackTrace();
		}
	}
	private void initHotBooks(Map<String,List> datas) {
		List<Book> books=new ArrayList<Book>();
		List<Product> pros;
		try {
			pros=ServiceDAOFactory.getProductService().findByHot(4);
			for(Product p:pros) {
				books.add((Book)p);
			}
			datas.put("hotBooks", books);
		}catch(Exception e) {
			e.printStackTrace();
		}
	}
	private void initCategory(Map<String,List> datas) {
		List<Category> cats;
		try {
			List<Category>list=ServiceDAOFactory.getCategoryService().findAll();
			cats=findByParentId(list,1);
			for(Category c: cats) {
				c.setSubCats(findByParentId(list,c.getId()));
			}
			datas.put("category", cats);
		}catch(Exception e) {
			e.printStackTrace();
		}
	}
	private List<Category> findByParentId(List<Category> list,int id){
		List<Category>subCats=new ArrayList<Category>();
		for(Category c: list) {
			if(c.getParentId()==id) {
				subCats.add(c);
			}
		}
		return subCats;
	}
}
